I was wondering if anybody knew of an online resource that publishes the correct ohm value for Dimarzio pup's. The reason I ask is that I ordered what I thought to be Super II's and the shop that is doing the work on my guitar did an impedance check and found them to be Super Distortions. I'm just curious what the difference in ohm's should be between the two.

Further, my understanding of why Garcia regularly changed out pups was that he thought they lost some of their punch, was this due to a decrease in ohm's or something else?

Also I should add that I'm a total novice when it comes to electronics so try to dumb down the answers, thanks.